Detector for warp stop motion



p 1952 w. A. BLANCHARD 2,609,011

DETECTOR FOR WARP STOP MOTION Filed May 26, 1951 FIGTZ FIG.3

2o 8 7 {A I! a 25 E I6 36 3 45 Y m 21 FJG.5 28

7 2a \7 4+ FIG.6 44 36 Z; FIG-.7 FIG.8 1 35 2a 3 35 l6 l5 5 INVENTOR WILLIAM A. BLANCHARD WW. M

ATTORNEY.

Patented Sept. 2, 1952 UNITED STATES PATENT OFFICE v 2,609,011- 7 a i nn rao'fit- F'Oit WARP s'ir M iiibi v" M William A. Blanchard, Millbury; Mass assignor I application rhis invention relates to improvements indetectors or drop wires for warp stop motions and it is the general objectrof the" inventionto' pro- Vide a cheap detecteor made-of bent wire.

The usual detector for drop wires is made from flat sheet metal by a punching operation which leaves a burr at theupper end of the thread slot in position to abradea warpthread on which the detector rests. This burr must be removed by a grinding: and polishing operation which is expensive anddoesnot/always; remove all of the bu'rr.

It is an important object of the'presentinvention to make the detector of pieces, of- Wire at least one piece of which hasarounded surface and is bent so as to provide'ian" eye or the like for the warp thread. The roundness'ofthe wire presents a smoothsurface for engagement with the warp thread and chafiing or abrasion of the latter is avoided; i

Many warp stopgmotions'operate with separator bars todivide the drop wiresinto several banks. These bars Marc usually imposition; to support the warp threadson their upper edges audit is. a further objectfiofI the invention to provide a detector'formed with aprimary outer wire'bent to ashapeawhich will enable it to engage adjacent separator bars; and provide a secondary. wire within the outline of the primary wire formed with th'e aforesaid thread eye.

It .is customary to have an; upwardly extending slot in the bottom of a" warp stop detector to receive awarp thread andit is-a further object of the invention to provide a ,detector formed with aprimaryouter: wire bent to' a sha-p'ewhich will 'enableit to engage-adjacent separator bars, and provide a; secondary-wire preferably within the outline, of the primary wireand formed with a downwardly opening, threadslot communicating with-the thread eye.

A" form of electric warp stop motion-which has gone into general-'use employsa contact bar having two electrodesncrmally insulated'from each otherbut electrically connected by'a falling detector. It is a further objectof the invention to provide a'detectoras described'hereinbefore having the upper pa-rts of the primary wire shaped to define a slot-to receive a contact bar and having portionsoi the, wire bent toward each other. into the slot for" cooperationwith the electrodes of the contact ba'r." I

In order that the eye" of the secondary wire may be held in fixedposition with'res'pectto the primary wire it {is a furtherobject of theinvention' to-form the eyesof that itcan be -welded or otherwise securedt'o"- adiacnt parts o'ithe 2 primary wire at points below the" upper part of the eye, thereby preventing any roug-liness which accompany joining of the two Wiresfrom being position for contact with the warp thread.

The primary and secondary wires are preferably o'fcir'cular czfoss section in their original forni and are then; r olled or' ressed to reduce their thickness but this" latter operation will not be necessaryinfailinstances;

In order that the invention ma'yf be clearly understood referen e is made to the accompanyin'g' drawings-which illustrate" by way of example the embodiments of; the inventioii'ahd in which:

Fig; 1 is a front elevation/of part of a warp stop motionshowin detectors made according" to the present'invention;

Fig; 2'" is an enlargedvertical section on line r -zgrig liy r Fig-.3 an: enlarged veiacaisection'- on line 3 4mm, 2,

Fig". 4 is an" enlarged horilzbntal section on line 4 4 ;-Fig; 2, i

Fig; 5 is an elevation o'f' the primary wire-form ing part of the detector,

Fig. 6 isan'elevatio'rrof the secondary wire forming part ofthedetectorland Figs; 7 n s are vertical sections-on lines'l 'l and IS -3;-respectivelyl of Figs; 5 and 6" before the? wire is" rolled to" be flattened as indicated in'nig. 3; 4

Referring to Figsa' 1" and a-the warp" st *m tionincludes anelectric contact bar i and-nortzontally s'paced separator'bars" 2 and 3belo'w"the' contact bar; Th'e warpthr'eads will ordi' naril y extend" aCrOssa'nd may reston th'e'top edges' offlthe"separator bars 2 and 3 and-reed toward the weaving iii'strum'en'talities of loom Ihe contact-bar lis" supp'orted with respe'ctto the separatonbars by a-=suppor't" 5"whicli may be heldto appropriate str'ucturenot shown" by means-of a 'bolt' The" contact bar includes" an inner: insulated electro'da'l and 'an' outerigen' era lly grounded electrodes; and these electrodes are "s'eparated by astrip of insulation 9'3 The elec'tr'odet has a-"rib lfl 'an'd' the'electrode-"l has a part I! thereof projecting beyond'itheoutline of the electrode-"8; tothe right as' viewed irr'Figi 25 The detectorforrning the" subject" matter of the present invention is d'es'ignated generally at D and: comprises primary and isecondary wires I5 and [6,- respective1y;'- which" are 'shaped' as shown in Figs. 5 and 6.- These 'wiresare-pref erably round 'in cross section in* their" originalform, as indicated in'FigsJ'I andS.

The primary wire l5 isbent to pi ovide*ver tical side members 20 and 2| which are separated horizontally from each other to defined a slot 22 for the contact bar I. The upper ends of the members 20 and 2| are joined by a bend 23 of the wire [5, and opposite parts of members 20 and 2| below bend 23 are bent toward each other into slot 22 as at 24 to provide for engagement with the rib l "and the extended part II of the insulated electrode 1.

The members and 2| have portions 25 and 26 thereof bent away from each other to provide a widened part of the primary wire for engagement with the separator bars, as will be apparent from Fig. 2. The members extenddownwardly from their portions 25 and 26 and are drawn toward each other as at 21 and then extend downwardly with parallel parts 28 spaced from each other. The lower ends of the members 20 and 2| may be bent in opposite directions as at 29.

The; secondary wire I6 is bent to define a rounded warp thread receiving eye 30 formed by upwardly curved parts 3| and 32 of the wire. The eye has an opening 33 at the lower side thereof which communicates with athread slot 34 lying between downwardly extending side members 35 and 36. The lower ends of these latter members are bent as at 31 to facilitate entry of a warp thread into slot 34.

The upper ends of portions 25 and 26 of the primary wire are bent as at 40 and 4| to conform substantially to the upper part of the eye in the secondary wire, as indicated in Fig. 2. The primary and secondary wires are secured to each other, as by welding, and lie in a common plane. The two wires may be welded together at 42 to join the portion 25 and 26 of the primary wire and the upwardly curved parts 3| and 32 below the top of the eye so that even though some roughness should be leftin the wire due to welding it will be below a thread supporting the detector. The parts 28 of the primary wire lie along and outside of the members 35 and 36 of the secondary member and may be welded to the latter as at 44.

After the primary and secondary wiresv have been bent as described they can if desired be subjected to a rolling operation which will flatten them so that it will have sides 45 and 46, see Fig. 3. In the flattening or rolling operation some of the original curvature of the wire is retained, particularly that part indicated at 41 on the under side of the top part of the secondary wire facing the eye 30, This curved part will be smooth and a warp thread can pass under it without abrasion-and no grinding or polishing operation will be necessary to form the surface 41 as has been necessary in the past when drop wires have been punched from fiat stock.

From the foregoing it will be seen that the invention sets forth a simple and cheap form of detector for warp stop motion comprising two wires secured to each other and lying in the same plane and bent so as to define a slot 22 in the upper part of the detector for the contact bar. The secondary wire is bent to define an eye 30 to receive a warp thread, and those parts of the wire defining the eye are between the portions 25 and 26 of the members 20 and 2|. The portions 25 and 26 of the primary wire are provided for engagement with the separator bars. Those parts of the secondary wire defining the eye are secured to the primary member at points below the top of the eye, and lower adjacent parts of the two wires may be secured together. The preferred method of attaching the two wires is by welding, but

the invention is not limited to this manner of securing them together. After the wires have been bent to the form shown for instance in Figs. 5 and 6 they may be rolled or pressed to reduce their thickness. The welding or other procedure to attach the two wires together may be done either before orafter the rolling operaion.

Having now particularly described and ascertained the nature of the invention and in what manner the same is to be performed, what is claimed is:

l. A detector for a warp stop motion including an electric contact bar, said detector comprising a piece of wire having side members the upper parts of which form a slot to receive the contact bar, and a second piece of wire secured to and between said side members formed with a rounded eye for a warp thread and having the parts thereof below the eye forming a thread receiving slot opening into said eye.

2. The detector set forth' in claim 1 wherein. parts of said members extend below said eye and. lie along the parts of the second piece of wire.

which form the thread slot.

3. The detector set forth in claim 1 wherein the: part of the second piece of wire in which the eye. is formed is secured to adjacent parts of said.

members.

4. The detector set forth in claim 1 whereirn the parts of the second piece of wire which form the thread slot are secured to the adjacent parts; of said members.

5. The detector set forth in claim 1 wherein said upper parts of the side members are bent toward each other for cooperation with the contact bar.

6. A detector for a warp stop motion having horizontally spaced warp thread supporting separator bars, said detector comprising a primary piece of wire having vertical members portions of which are bent away from each other for engagement with the separator bars, a secondary piece of wire securedto the primary wire formed on the upper part thereof with a rounded warp thread eye having an opening in the bottom thereof and located between said portions of the primary wire, said secondary wire having spaced parts thereof depending from the eye to form a thread slot communicating with said opening.

7. The detector set forth in claim 6 wherein the part of the secondary wire forming said eye is welded to said portions of the vertical members.

8. A detector for a warp stop motion having horizontally spaced warp supporting separator bars, said detector comprising a piece of wire having side members in a vertical plane joined at their upper ends-and havingportions thereof below said upper ends bent away from each other for engagement with said separator bars, said members extending below said portions and having parallel horizontally spaced parts between which a warp thread can move upwardly toward said portions, and a second piece of wire secured to said portions having upwardly extending curved parts to form a warp thread receiving eye between said portions open at the bottom thereof to receive a warp thread. 7

9. A detector for a warp stop motion having horizontally spaced warp supporting separator bars, said detector'comprising a primary wire having side members in a .vertical plane joined at their upper ends and having portions thereof below said upper ends bent away from each other for engagement with said separator bars, and a secondary wire having upwardly extending curved parts to form a warp thread receiving eye between said portions. the lower portions of said upwardly curved parts of the secondary wire being secured to said side members below the top of said thread receiving eye.

10. A detector for a warp stop motion having horizontally spaced warp supporting separator bars, said detector comprising primary and secondary pieces of bent wire both lying in the same vertical plane, the primary wire having side members portions of which are bent away from each other for engagement of said separator bars, and

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Name Date Draper Apr. 9, 1901 Number 

